pwc.h
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上传日期:2013-02-24
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- /* (C) 1999-2001 Nemosoft Unv. (webcam@smcc.demon.nl)
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef PWC_H
- #define PWC_H
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/usb.h>
- #include <linux/spinlock.h>
- #include <linux/videodev.h>
- #include <linux/wait.h>
- #include <linux/smp_lock.h>
- #include <asm/semaphore.h>
- #include <asm/errno.h>
- /* Defines and structures for the Philips webcam */
- /* Used for checking memory corruption/pointer validation */
- #define PWC_MAGIC 0x89DC10ABUL
- #undef PWC_MAGIC
- /* Turn some debugging options on/off */
- #define PWC_DEBUG 0
- /* Trace certain actions in the driver */
- #define TRACE_MODULE 0x0001
- #define TRACE_PROBE 0x0002
- #define TRACE_OPEN 0x0004
- #define TRACE_READ 0x0008
- #define TRACE_MEMORY 0x0010
- #define TRACE_FLOW 0x0020
- #define TRACE_SIZE 0x0040
- #define TRACE_PWCX 0x0080
- #define TRACE_SEQUENCE 0x1000
- #define Trace(R, A...) if (pwc_trace & R) printk(KERN_DEBUG PWC_NAME " " A)
- #define Debug(A...) printk(KERN_DEBUG PWC_NAME " " A)
- #define Info(A...) printk(KERN_INFO PWC_NAME " " A)
- #define Err(A...) printk(KERN_ERR PWC_NAME " " A)
- /* Defines for ToUCam cameras */
- #define TOUCAM_HEADER_SIZE 8
- #define TOUCAM_TRAILER_SIZE 4
- /* Version block */
- #define PWC_MAJOR 8
- #define PWC_MINOR 5
- #define PWC_VERSION "8.5"
- #define PWC_NAME "pwc"
- /* Turn certain features on/off */
- #define PWC_INT_PIPE 0
- /* Ignore errors in the first N frames, to allow for startup delays */
- #define FRAME_LOWMARK 5
- /* Size and number of buffers for the ISO pipe. */
- #define MAX_ISO_BUFS 2
- #define ISO_FRAMES_PER_DESC 10
- #define ISO_MAX_FRAME_SIZE 960
- #define ISO_BUFFER_SIZE (ISO_FRAMES_PER_DESC * ISO_MAX_FRAME_SIZE)
- /* Frame buffers: contains compressed or uncompressed video data. */
- #define MAX_FRAMES 5
- /* Maximum size after decompression is 640x480 YUV data, 1.5 * 640 * 480 */
- #define PWC_FRAME_SIZE (460800 + TOUCAM_HEADER_SIZE + TOUCAM_TRAILER_SIZE)
- /* Absolute maximum number of buffers available for mmap() */
- #define MAX_IMAGES 4
- struct pwc_coord
- {
- int x, y; /* guess what */
- int size; /* size, or offset */
- };
- /* The following structures were based on cpia.h. Why reinvent the wheel? :-) */
- struct pwc_iso_buf
- {
- void *data;
- int length;
- int read;
- purb_t urb;
- };
- /* intermediate buffers with raw data from the USB cam */
- struct pwc_frame_buf
- {
- void *data;
- volatile int filled; /* number of bytes filled */
- struct pwc_frame_buf *next; /* list */
- #if PWC_DEBUG
- int sequence; /* Sequence number */
- #endif
- };
- struct pwc_device
- {
- #ifdef PWC_MAGIC
- int magic;
- #endif
- /* Pointer to our usb_device */
- struct usb_device *udev;
-
- int type; /* type of cam (645, 646, 675, 680, 690) */
- int release; /* release number */
- int unplugged; /* set when the plug is pulled */
- int usb_init; /* set when the cam has been initialized over USB */
- /*** Video data ***/
- int vopen; /* flag */
- struct video_device *vdev;
- int vendpoint; /* video isoc endpoint */
- int vcinterface; /* video control interface */
- int valternate; /* alternate interface needed */
- int vframes, vsize; /* frames-per-second & size (see PSZ_*) */
- int vpalette; /* YUV, RGB24, RGB32, etc */
- int vframe_count; /* received frames */
- int vframes_dumped; /* counter for dumped frames */
- int vframes_error; /* frames received in error */
- int vmax_packet_size; /* USB maxpacket size */
- int vlast_packet_size; /* for frame synchronisation */
- int vcompression; /* desired compression factor */
- int vbandlength; /* compressed band length; 0 is uncompressed */
- char vsnapshot; /* snapshot mode */
- char vsync; /* used by isoc handler */
-
- /* The image acquisition requires 3 to 4 steps:
- 1. data is gathered in short packets from the USB controller
- 2. data is synchronized and packed into a frame buffer
- 3a. in case data is compressed, decompress it directly into image buffer
- 3b. in case data is uncompressed, copy into image buffer with viewport
- 4. data is transfered to the user process
- Note that MAX_ISO_BUFS != MAX_FRAMES != MAX_IMAGES....
- We have in effect a back-to-back-double-buffer system.
- */
- /* 1: isoc */
- struct pwc_iso_buf sbuf[MAX_ISO_BUFS];
- char iso_init;
-
- /* 2: frame */
- struct pwc_frame_buf *fbuf; /* all frames */
- struct pwc_frame_buf *empty_frames, *empty_frames_tail; /* all empty frames */
- struct pwc_frame_buf *full_frames, *full_frames_tail; /* all filled frames */
- struct pwc_frame_buf *fill_frame; /* frame currently being filled */
- struct pwc_frame_buf *read_frame; /* frame currently read by user process */
- int frame_size;
- int frame_header_size, frame_trailer_size;
- int drop_frames;
- #if PWC_DEBUG
- int sequence; /* Debugging aid */
- #endif
-
- /* 3: decompression */
- struct pwc_decompressor *decompressor; /* function block with decompression routines */
- void *decompress_data; /* private data for decompression engine */
- /* 4: image */
- /* We have an 'image' and a 'view', where 'image' is the fixed-size image
- as delivered by the camera, and 'view' is the size requested by the
- program. The camera image is centered in this viewport, laced with
- a gray or black border. view_min <= image <= view <= view_max;
- */
- int image_mask; /* bitmask of supported sizes */
- struct pwc_coord view_min, view_max; /* minimum and maximum sizes */
- struct pwc_coord image, view; /* image and viewport size */
- struct pwc_coord offset; /* offset within the viewport */
- void *image_data; /* total buffer, which is subdivided into ... */
- void *image_ptr[MAX_IMAGES]; /* ...several images... */
- int fill_image; /* ...which are rotated. */
- int len_per_image; /* length per image */
- int image_read_pos; /* In case we read data in pieces, keep track of were we are in the imagebuffer */
- int image_used[MAX_IMAGES]; /* For MCAPTURE and SYNC */
- struct semaphore modlock; /* to prevent races in video_open(), etc */
- spinlock_t ptrlock; /* for manipulating the buffer pointers */
- /*** Misc. data ***/
- wait_queue_head_t frameq; /* When waiting for a frame to finish... */
- wait_queue_head_t remove_ok; /* When we got hot unplugged, we have to avoid a few race conditions */
- #if PWC_INT_PIPE
- void *usb_int_handler; /* for the interrupt endpoint */
- #endif
- };
- /* Enumeration of image sizes */
- #define PSZ_SQCIF 0x00
- #define PSZ_QSIF 0x01
- #define PSZ_QCIF 0x02
- #define PSZ_SIF 0x03
- #define PSZ_CIF 0x04
- #define PSZ_VGA 0x05
- #define PSZ_MAX 6
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* Global variables */
- extern int pwc_trace;
- extern int pwc_preferred_compression;
- /** functions in pwc-if.c */
- int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot);
- /** Functions in pwc-misc.c */
- /* sizes in pixels */
- extern struct pwc_coord pwc_image_sizes[PSZ_MAX];
- int pwc_decode_size(struct pwc_device *pdev, int width, int height);
- void pwc_construct(struct pwc_device *pdev);
- /** Functions in pwc-ctrl.c */
- /* Request a certain video mode. Returns < 0 if not possible */
- extern int pwc_set_video_mode(struct pwc_device *pdev, int width, int height, int frames, int compression, int snapshot);
- /* Calculate the number of bytes per image (not frame) */
- extern void pwc_set_image_buffer_size(struct pwc_device *pdev);
- /* Various controls; should be obvious. Value 0..65535, or < 0 on error */
- extern int pwc_get_brightness(struct pwc_device *pdev);
- extern int pwc_set_brightness(struct pwc_device *pdev, int value);
- extern int pwc_get_contrast(struct pwc_device *pdev);
- extern int pwc_set_contrast(struct pwc_device *pdev, int value);
- extern int pwc_get_gamma(struct pwc_device *pdev);
- extern int pwc_set_gamma(struct pwc_device *pdev, int value);
- extern int pwc_get_saturation(struct pwc_device *pdev);
- extern int pwc_set_saturation(struct pwc_device *pdev, int value);
- extern int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value);
- extern int pwc_get_leds(struct pwc_device *pdev, int *on_value, int *off_value);
- /* Power down or up the camera; not supported by all models */
- extern int pwc_camera_power(struct pwc_device *pdev, int power);
- /* Private ioctl()s; see pwc-ioctl.h */
- extern int pwc_ioctl(struct pwc_device *pdev, unsigned int cmd, void *arg);
- /** pwc-uncompress.c */
- /* Expand frame to image, possibly including decompression. Uses read_frame and fill_image */
- extern int pwc_decompress(struct pwc_device *pdev);
- #ifdef __cplusplus
- }
- #endif
- #endif